As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
COCKPIT & CABIN ODOR IN DESCENT, STARTED AT 13000 DISSIPATED AT 7000. SMELLED PNEUMATIC IN COCKPIT & FRONT CABIN. CONDITION CHECKED FWD EE COMPARTMENT P110, 210, 310 & 320 INSIDE NO SMOKE OR SMELL. P 100 - 300 & MAIN BATTERY AREA CONDITION CHECKED OK WITH LT & RT PACKS ON.